The most common and most likely answer to this crossword clue is the 6 letter word FRIEZE
I've seen this crossword clue in The Guardian
F
R
I
E
Z
E
More clues leading to the result FRIEZE
- Band going to wall in very cold weather, say?
- On radio, shout by cop with gun provides picture
- Carved strip, cool by the sound of it?
- Sounds like thoroughly cool artwork
- Said ‘Don’t move decoration‘
- Reportedly fix wall decoration
- Call for temporary halt in painting
- Architectural feature‘s lavish, attracting Italian and unknown separately
- Band releases broadcast
- Architectural feature that could leave you cold, we hear
Buddy explains!

The straight part
We know that "decoration" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case decoration = frieze.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does FRIEZE mean?
FRIEZE noun- A kind of coarse woolen cloth or stuff with a shaggy or tufted (friezed) nap on one side.
- To make a nap on (cloth); to friz.
- That part of the entablature of an order which is between the architrave and cornice. It is a flat member or face, either uniform or broken by triglyphs, and often enriched with figures and other ornaments of sculpture.
- Any sculptured or richly ornamented band in a building or, by extension, in rich pieces of furniture.
- A banner with a series of pictures.
- To put a frieze on.